Los Angeles Municipal Code Div. 9 Alterations – Level 3

(Title Amended by Ord. No. 188,797, Eff. 12/31/25.)

Section

91.2.900 Basic Provisions.

91.2.906 Structural.

(Amended by Ord. No. 188,797, Eff. 12/31/25.)

Chapter 9 of the CEBC is hereby adopted by reference except as amended herein.

(Added by Ord. No. 188,797, Eff. 12/31/25.)

Section 906 of the CEBC is hereby adopted by reference except as amended herein.

91.2.906.2. Existing structural elements resisting lateral loads. Where work involves a substantial structural alteration, the lateral load-resisting system of the altered building shall be shown to satisfy the requirements of Section 1609 of the California Building Code and Section 304.3.2 of this code. Reduced seismic forces, in accordance with CEBC Section 304.3.2, shall be permitted, provided the reduced seismic load is not less than the original building permitted seismic loads. Where the building is assigned to Seismic Design Category D or F, supports and attachments for nonstructural components required to serve any portion of the building with a use included in Risk Category IV shall comply with Section 1613 of the California Building Code or shall comply with ASCE 41 using an objective of Position Retention nonstructural performance with the BSE-1E earthquake hazard level.

EXCEPTIONS:

1. Buildings of Group R occupancy with not more than five dwelling or sleeping units used solely for residential purposes that are altered based on the conventional light-frame construction methods of the California Building Code or in compliance with the provisions of the California Residential Code.

2. Where the intended alteration involves only the lowest story of a building, only the lateral load resisting components in and below that story need comply with this section. The alternations do not create structural irregularity as defined in ASCE 7 or make an existing structural irregularity more severe.